In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

One Nation leader Pauline Hanson has described how Senator Rod Culleton was a pain in her backside after he announced his resignation party.

Senator Culleton revealed his departure late last night, claiming Ms Hanson was treating him and his team in an "un-Australian" manner.

He vowed to remain in parliament as an Independent.

Ms Hanson has now hit back at Mr Culleton, telling 9NEWS she was glad to see him go.

"He's not a team player," Ms Hanson told TODAY Show co-host Lisa Wilkinson.

"He’s media driven, he likes to see his name in the paper."

Ms Hanson said Mr Culleton did not even contact her to let her know he was resigning. Instead she was woken up in the middle of the night by a call and told he had posted to social media announcing his departure.

Mr Culleton, in announcing his resignation, cited a lack of respect from party colleagues and a slew of policy splits between he and the One Nation team.

He also accused Ms Hanson and Mr Ashby of trying to force him to resign and wielding control over his office.

Asked what Mr Culleton's resignation means for government negotiations, Treasurer Scott Morrison said the government would wait to see the Senate composition when parliament resumed in February.

Government backbencher Eric Abetz, who managed Senate business under Tony Abbott, says it's likely Mr Culleton's resignation will make the coalition's task harder.

"Rod Culleton's resignation from Pauline Hanson's One Nation is completely and utterly out of the hands of the coalition," he told ABC radio.

"But yes you're right, chances are our task becomes more difficult and that is why it is imperative for (Labor leader) Bill Shorten to get with the program of delivering genuine economic reform for our nation."